30. April 2018 - Sebastian Evers
Storage media with data loss:
Data specified for recovery:
After a power blackout an important server within the storage area network of a churchly company failed. An iSCSI target containing a VMFS volume was not accessible via hypervisor (VMWare ESXi) and the availability was displayed with 0%. The ALLNet ALL6600 NAS and the ESXi were both rebooted, with the same result. Both hard disks were checked for damages, but appeared to be faultless. As with a previous data loss, Attingo was contacted once more.
The physical analysis in the Attingo cleanroom laboratory showed that both hard disks had no physical damagesa and 100% raw data of both disks could be copied. The logical analysis revealed that the RAID 1 was degraded for a long time and the data of both disks was not in sync. The technician was able to access the VMFS volume of the more up-to-date disk and extract both important *.vmdk files. As requested the virtual machines were converted onto two separate physical storage media and delivered to the customer, who copied them back onto a newly created RAID system.